That's probably because you've updated to a newer version of PHP which vBSEO was never updated to support.Just taken a look and all i did was disable VBSEO, turned it all back on again and changed the .htaccess file but then the i lose my site?
RewriteRule [^/]+/([0-9]+)-[^/]+\.html http://www.**********8.co.uk/showthread.php?t=$1 [L,R=301]
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